/Engine/Source/Runtime/Engine/Classes/Animation/AnimData/IAnimationDataController.h
Adds a new attribute with the provided information. Broadcasts a EAnimDataModelNotifyType::AttributeAdded notify if successful.
Whether or not the attribute was successfully added
bool AddAttribute ( const [FAnimationAttributeIdentifier](API\Runtime\Engine\Animation\AnimData\FAnimationAttributeIdentifier) & AttributeIdentifier, bool bShouldTransact )